CVE-2024-38544: RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt
First published: Wed Jun 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt In rxe_comp_queue_pkt() an incoming response packet skb is enqueued to the resp_pkts queue and then a decision is made whether to run the completer task inline or schedule it. Finally the skb is dereferenced to bump a 'hw' performance counter. This is wrong because if the completer task is already running in a separate thread it may have already processed the skb and freed it which can cause a seg fault. This has been observed infrequently in testing at high scale. This patch fixes this by changing the order of enqueuing the packet until after the counter is accessed.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.93 | 6.1.93 |
| redhat/kernel | <6.6.33 | 6.6.33 |
| redhat/kernel | <6.8.12 | 6.8.12 |
| redhat/kernel | <6.9.3 | 6.9.3 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
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Reference Links
- https://git.kernel.org/stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794
- https://git.kernel.org/stable/c/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6
- https://git.kernel.org/stable/c/30df4bef8b8e183333e9b6e9d4509d552c7da6eb
- https://git.kernel.org/stable/c/bbad88f111a1829f366c189aa48e7e58e57553fc
- https://git.kernel.org/stable/c/faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19
- https://launchpad.net/bugs/cve/CVE-2024-38544
- https://access.redhat.com/security/cve/CVE-2024-38544
- https://lore.kernel.org/linux-cve-announce/2024061949-CVE-2024-38544-601b@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:5928
- https://bugzilla.redhat.com/show_bug.cgi?id=2293455
- https://git.kernel.org/stable/c/de5a059e36657442b5637cc16df5163e435b9cb4
- https://git.kernel.org/stable/c/e0e14dd35d4242340c7346aac60c7ff8fbf87ffc
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38544
- https://nvd.nist.gov/vuln/detail/CVE-2024-38544
- https://security-tracker.debian.org/tracker/CVE-2024-38544
- https://ubuntu.com/security/CVE-2024-38544
- https://git.kernel.org/linus/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6
- https://git.kernel.org/stable/c/c91fb72a2ca6480d8d77262eef52dc5b178463a3
Frequently Asked Questions
What is the severity of CVE-2024-38544?
The severity of CVE-2024-38544 is classified as moderate due to the potential for a segmentation fault.
How do I fix CVE-2024-38544?
To fix CVE-2024-38544, upgrade your Linux kernel to version 6.1.93 or higher, or apply the latest security patches from your distribution.
Which Linux kernel versions are affected by CVE-2024-38544?
CVE-2024-38544 affects several versions of the Linux kernel, including versions prior to 6.1.93, 6.6.33, 6.8.12, 6.9.3, and 6.10.
Is there a workaround for CVE-2024-38544?
There is no widely recommended workaround for CVE-2024-38544; applying the update is the best course of action.
What components are impacted by CVE-2024-38544?
CVE-2024-38544 specifically impacts the RDMA/rxe component of the Linux kernel.
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